I plugged the unit into a PC and can view the nook drive and SD card memory.
I called B&N support and they suggested letting the battery run dead, and then charging it.
After all this I tried to swap out the main board hoping that this was the part that died because I have two of them and all etc.
anyway no luck with the black screen. In the parts of the cracked screen that still work I get full boot on both boards, that leads me to believe that the screen has died, is there any other potential causes or is it just a good old hardware failure?